Laser photoexcitation of Rydberg states in helium with <i>n</i> &gt; 400

Hogan, S. D.; Houston, Y; Wei, Boxin

doi:10.1088/1361-6455/aac8a1

Cited by 17 publications

(32 citation statements)

References 33 publications

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“…These electrodes were separated by 13 mm. The Rydberg states were prepared using a resonance-enhanced two-photon excitation scheme, with UV and IR laser beams [27]. The UV laser was frequency stabilized to be resonant with the 1s2s 3 S 1 → 1s3p 3 P 2 transition at 25 708.587 6 cm −1 (≡ 388.975 1 nm).…”

Section: Methodsmentioning

confidence: 99%

Rydberg-state ionization dynamics and tunnel ionization rates in strong electric fields

Gawlas

Hogan

2019

Phys. Rev. A

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Tunnel ionization rates of triplet Rydberg states in helium with principal quantum numbers close to 37 have been measured in electric fields at the classical ionization threshold of ∼ 197 V/cm. The measurements were performed in the time domain by combining high-resolution continuous-wave laser photoexcitation and pulsed electric field ionization. The observed tunnel ionization rates range from 10 5 s −1 to 10 7 s −1 and have, together with the measured atomic energy-level structure in the corresponding electric fields, been compared to the results of calculations of the eigenvalues of the Hamiltonian matrix describing the atoms in the presence of the fields to which complex absorbing potentials have been introduced. The comparison of the measured tunnel ionization rates with the results of these, and additional calculations for hydrogen-like Rydberg states performed using semiempirical methods, have allowed the accuracy of these methods of calculation to be tested. For the particular eigenstates studied the measured ionization rates are ∼ 5 times larger than those obtained from semi-empirical expressions.

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Section: Methodsmentioning

confidence: 99%

Rydberg-state ionization dynamics and tunnel ionization rates in strong electric fields

Gawlas

Hogan

2019

Phys. Rev. A

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“…Drift rates as low as 2 µV cm −1 h −1 have also been measured [70]. Such measurements could be performed independently using a co-electrometry with a different species [69,70]. For a field of 30 µV cm −1 , the quadratic Stark effect is dominant for s-states, and measurements with 10 Hz uncertainty should be possible up to n = 23, with n ≈ 40 accessible if the stray field is determined to 1 µV cm −1 .…”

Section: A Improved Measurementsmentioning

confidence: 90%

“…However other experiment have shown that stray fields can be reduced to the 30 µV cm −1 level by performing electrometry with high-n states (n > 100) [68,69]. Drift rates as low as 2 µV cm −1 h −1 have also been measured [70]. Such measurements could be performed independently using a co-electrometry with a different species [69,70].…”

Section: A Improved Measurementsmentioning

confidence: 99%

Probing new physics using Rydberg states of atomic hydrogen

Jones

Potvliege²,

Spannowsky

2020

Phys. Rev. Research

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We consider the role of high-lying Rydberg states of simple atomic systems such as 1 H in setting constraints on physics beyond the Standard Model. We obtain highly accurate bound states energies for a hydrogen atom in the presence of an additional force carrier (the energy levels of the Hellmann potential). These results show that varying the size and shape of the Rydberg state by varying the quantum numbers provides a way to probe the range of new forces. By combining these results with the current state-of-the-art QED corrections, we determine a robust global constraint on new physics that includes all current spectroscopic data in hydrogen. Lastly we show that improved measurements that fully exploit modern cooling and trapping methods as well as higher-lying states could lead to a strong, statistically robust global constraint on new physics based on laboratory measurements only.

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“…At the position between these electrodes where their separation in the x dimension was 19 mm the atoms were prepared in the |n = 55, = 54, m = +54 ≡ |55c circular Rydberg state using the crossed fields method [46,47]. To implement this, laser photoexcitation was carried out in the presence of perpendicular pulsed electric and static magnetic fields of regions of the electromagnetic spectrum [48]. After photoexcitation the electric field was switched off adiabatically to transfer the atomic population into the |55c state as indicated in Fig.…”

Section: Interferometry Schemementioning

confidence: 99%

Matter-wave interferometry with atoms in high Rydberg states

Palmer

Hogan

2019

Molecular Physics

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Matter-wave interferometry has been performed with helium atoms in high Rydberg states.In the experiments the atoms were prepared in coherent superpositions of Rydberg states with different electric dipole moments. Upon the application of an inhomogeneous electric field, the different forces on these internal state components resulted in the generation of coherent superpositions of momentum states. Using a sequence of microwave and electric field gradient pulses the internal Rydberg states were entangled with the momentum states associated with the external motion of these matter waves. Under these conditions matter-wave interference was observed by monitoring the populations of the Rydberg states as the magnitudes and durations of the pulsed electric field gradients were adjusted. The results of the experiments have been compared to, and are in excellent quantitative agreement with, matter-wave interference patterns calculated for the corresponding pulse sequences. For the Rydberg states used, the spatial extent of the Rydberg electron wavefunction was ∼ 320 nm. Matter-wave interferometry with such giant atoms is of interest in the exploration of the boundary between quantum and classical mechanics. The results presented also open new possibilities for measurements of the acceleration of Rydberg positronium or antihydrogen atoms in the Earth's gravitational field. arXiv:1907.07649v1 [physics.atom-ph] 17 Jul 2019Recently, in a similar vein, coherent momentum splitting of laser cooled rubidium atoms, prepared in chip-based magnetic traps, was demonstrated using pulsed inhomogeneous magnetic fields and a sequence of radio-frequency (RF) pulses to prepare, and coherently manipulate, ground-state Zeeman sublevels [44]. In these experiments a π/2 pulse of RF radiation was first applied to prepare a coherent superposition of sublevels with magnetic dipole moments of equal magnitude but opposite orientation, in a homogeneous background magnetic field. The atoms were then subjected to a pulsed inhomogeneous magnetic field. The forces exerted by this field gradient on each component of the internal-state superposition resulted in the generation of a superposition of momentum states. Spatial interferences between the resulting pairs of matter waves were then observed by state-selective imaging of the atoms

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Laser photoexcitation of Rydberg states in helium with n > 400

Cited by 17 publications

References 33 publications

Rydberg-state ionization dynamics and tunnel ionization rates in strong electric fields

Rydberg-state ionization dynamics and tunnel ionization rates in strong electric fields

Probing new physics using Rydberg states of atomic hydrogen

Matter-wave interferometry with atoms in high Rydberg states

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